WFU Department of Physics Wake Forest University

 

Wake Forest Physics
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WFU Physics Colloquium

TITLE: Ph. D. Thesis presentation: Calculating Magnetic Properties of Materials using Density Functional Theory

SPEAKER: Graham Lopez,

Department of Physics
Wake Forest University

TIME: Friday June 28 2013 at 12:30 PM

PLACE: Room 107 Olin Physical Laboratory


All interested persons are cordially invited to attend the public presentation. The Ph. D. defense will follow.

ABSTRACT

Magnetic properties are of great importance in materials science because of their applicability to both experimental techniques such as electron paramagnetic resonance and nuclear magnetic resonance, as well as many technological applications such as storage media. We present the implementation of efficient methods of calculating from first principles the orbital magnetization and NMR parameters of solids. It is shown how the orbital magnetization can be evaluated using an interpolation scheme that allows the use of a very fine mesh that would be impractical using other methods. We also show how NMR chemical shielding parameters can be calculated without the need for a computationally intensive linear response framework. Then, the utility of NMR calculations is demonstrated for a system of current interest in energy and environmental applications. We show how these NMR calculations can complement the information about host-guest interactions gained from other experimental techniques, as well as provide useful guidance for interpreting experimental NMR results. Finally, preliminary work has been done for extending the van der Waals density functional to include spin polarization effects, necessary for computational study of weakly interacting systems where spin also has an important role.



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100 Olin Physical Laboratory
Wake Forest University
Winston-Salem, NC 27109-7507
Phone: (336) 758-5337, FAX: (336) 758-6142
E-mail:
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